Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 103, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 18, 2011, 7:30 PM EDT for Middlesex County, Worcester County, Massachusetts; Cheshire County, Hillsborough County, New Hampshire. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2011, 7:30 PM EDT (23:30 UTC)
- Expired
- Aug 18, 2011, 8:30 PM EDT
- In force
- 60 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Worcester County, MA, Cheshire County, NH, Hillsborough County, NH
The radar
The Boston radar (KBOX), 105 km from the middle of the area, began a volume at 23:33 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 11.5 hours before the alert went out and 163 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 130 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1201 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
727 WUUS51 KBOX 182330 SVRBOX MAC017-027-NHC005-011-190030- /O.NEW.KBOX.SV.W.0103.110818T2330Z-110819T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 730 PM EDT THU AUG 18 2011 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS... NORTHWESTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS... SOUTHEASTERN CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE... SOUTH CENTRAL HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE... * UNTIL 830 PM EDT * AT 728 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WINCHENDON...OR 9 MILES SOUTH OF JAFFREY...AND WAS MOVING EAST AT 10 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE...ASHBURNHAM...SHARON...NEW IPSWICH...TEMPLE...ASHBY...GREENVILLE...MASON...LUNENBURG AND TOWNSEND. SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW... INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID FLOODED ROADS. && LAT...LON 4285 7168 4259 7166 4263 7208 4279 7207 TIME...MOT...LOC 2330Z 270DEG 10KT 4269 7196 $$ DUNTEN
3 follow-up statements
415
WWUS51 KBOX 182354
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
754 PM EDT THU AUG 18 2011
NHC005-190004-
/O.CAN.KBOX.SV.W.0103.000000T0000Z-110819T0030Z/
CHESHIRE NH-
754 PM EDT THU AUG 18 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESHIRE COUNTY
IS CANCELLED...
LAT...LON 4259 7166 4263 7199 4271 7198 4271 7193
4279 7194 4279 7196 4280 7195 4285 7168
TIME...MOT...LOC 2354Z 287DEG 16KT 4266 7185
$$
MAC017-027-NHC011-190030-
/O.CON.KBOX.SV.W.0103.000000T0000Z-110819T0030Z/
MIDDLESEX MA-WORCESTER MA-HILLSBOROUGH NH-
754 PM EDT THU AUG 18 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTH CENTRAL HILLSBOROUGH...NORTH CENTRAL WORCESTER AND
NORTHWESTERN MIDDLESEX COUNTIES...
AT 750 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR ASHBURNHAM...OR 6 MILES NORTHWEST OF FITCHBURG...MOVING
EAST AT 15 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ASHBY...MASON AND TOWNSEND
LAT...LON 4259 7166 4263 7199 4271 7198 4271 7193
4279 7194 4279 7196 4280 7195 4285 7168
TIME...MOT...LOC 2354Z 287DEG 16KT 4266 7185
$$
DUNTEN217
WWUS51 KBOX 190013
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
813 PM EDT THU AUG 18 2011
NHC011-190023-
/O.CAN.KBOX.SV.W.0103.000000T0000Z-110819T0030Z/
HILLSBOROUGH NH-
813 PM EDT THU AUG 18 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL HILLSBOROUGH
COUNTY IS CANCELLED...
LAT...LON 4271 7169 4270 7167 4259 7166 4262 7191
4271 7185
TIME...MOT...LOC 0013Z 294DEG 13KT 4263 7178
$$
MAC017-027-190030-
/O.CON.KBOX.SV.W.0103.000000T0000Z-110819T0030Z/
MIDDLESEX MA-WORCESTER MA-
813 PM EDT THU AUG 18 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTH CENTRAL WORCESTER AND NORTHWESTERN MIDDLESEX COUNTIES...
AT 811 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR ASHBY...OR NEAR FITCHBURG...MOVING SOUTHEAST AT 15 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
TOWNSEND
LAT...LON 4271 7169 4270 7167 4259 7166 4262 7191
4271 7185
TIME...MOT...LOC 0013Z 294DEG 13KT 4263 7178
$$
DUNTEN108
WWUS51 KBOX 190026
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
826 PM EDT THU AUG 18 2011
MAC017-027-190037-
/O.EXP.KBOX.SV.W.0103.000000T0000Z-110819T0030Z/
MIDDLESEX MA-WORCESTER MA-
826 PM EDT THU AUG 18 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WORCESTER AND
NORTHWESTERN MIDDLESEX COUNTIES WILL EXPIRE AT 830 PM EDT...
LAT...LON 4271 7169 4270 7167 4259 7166 4262 7191
4271 7185
TIME...MOT...LOC 0027Z 283DEG 12KT 4262 7173
$$
DUNTENThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 6:24 PM EDT | Special Weather Statement | BOX | Hampden | 36 min |
| Aug 18, 7:50 PM EDT | Areal Flood Advisory | BOX | Middlesex, Worcester | 2 hr |
| Aug 18, 5:46 PM EDT | Special Weather Statement | BOX | Cheshire | 44 min |
| Aug 18, 6:39 PM EDT | Special Weather Statement | BOX | Cheshire | 51 min |
| Aug 18, 7:26 PM EDT | Special Weather Statement | BOX | Hillsborough | 49 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2011Severe Thunderstorm Warnings in New Hampshire, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.